Method for synthetic production of cyanids and nitrids



A. R. LINDBLAD. METHOD FOR SYNTHETIC PRODUCTION OF CYANIDS AND NITRIDS'.

APPLICATION FILED OCT.I8.19I8.

1,328,575, Patented Jan. 20,1920.

I/VVE/YTOITI 7 WM UNITED STATES PATENT OFFICE.

AXEL RUDOLF LINDBLAD, OF STOCKHOLM, SWEDEN.

METHOD FOR SYNTHETIC PRODUCTION OF GYANIDS AND NITRIDS.

a To all whom it may concern:

Be it'known that I, AxEL RUDOLF LINDBLAD,

L l'h. D., subject of the King of Sweden, re-

siding at Gustaf Adolfs Torg 18, Stockholm,

in the Kingdom of Sweden, hav invented gen or nitrogenous gases have been pressed through the charge. It has however, been a matter of great difiiculty to construct perfectly gastight furnaces. It is diflicult to effeet a perfectly tight packing around the electrodes. In the masonry there easily occurs cracks, leakages arise in the chargi rg devices, and so on. It therefore often occurs that a great deal of the nitrogen pressed into the furnace is, not utilized for the purpose of the reaction, but leaks away. In order to obviate this, one proceeds, in accordance with the present invention, in such a manner that the raw material required for the process is charged into an electric furnace, and is there subjected to heating by the action of an electric current, while, at the same time the nitrogen or nitrogenous gases, required for carrying out the process, are sucked out through the Efurnace from a higher situated level to a lower, so that the gases and the solid or liquid materials forming the charge, pass through the furnace in the same direction.

On th accompanying drawing is shown, by way of example, an electric furnace adapted for carrying out the process in question.

1 is the furnace chamber into which the charge is filled in order to be heated by electric current, which is supplied and led off by means of the electrode 2 hanging down into the furnace and the bottom electrode 3. 4 is a discharge opening for tapping the slag formed in the process. 5 is an outlet or suction pipe, for the reaction gases, arranged in the vicinity of the discharge opening and combined with a suction device. With the Specification of Letters Patent.

Patented Jan. 20, 19.20.

Application filed October 18, 1918. Serial No. 258,739.

use of this furnace, the process, in case, for example, alkali-cyanids are to be produced, will be as follows Carbon and a suitable alkali compound are charged into the furnace chamber 1 and are heated to reaction temperature by means of the electric current. By effecting suction in the gas outlet 5 air is sucked into the charge in the manner indicated by the arrows. The oxygen of the-.air burns part of the carbon of the material of the charge,

while the nitrogen together with carbon and reduced alkali metal form cyanid. The cyanid obtained passes off in the form of gas or dust through the opening 5 together with the reaction gases sucked out from the furnace andany surplus of air. Slag formed in th process is tapped oif continuously or at suitable intervals through the top opening 4.

In the production of nitrids, a tapping in the ordinary manner cannot take place, as

the nitride are as a rule unnieltable. It will' therefore be necessary to rake them out in an unmelted condition from the furnace through a discharge opening arranged in its lower part.

As the process has been above described, the suction outlet has been arranged in the lower part of the furnace and the admission of the nitrogreous gas (in the example quoted, air), has taken place in the upper part of the furnace, i. 0., the gas and the solid or melted materials of the charge have been conceived as passing through the-furnace in the same direction, which has proved advantageous for the process.

In the example quoted the electric furnace has been conceived as a shaft furnace open at the top. There is however nothing to prevent its being entirely or partially covered, if this should be considered more suitable.

Having thus described my invention, I declare, that what I claim'is:

1. A process for producing nitrids and cyanids, which consists in charging the raw materials into an electric furnace and subjecting them 'to heat by the action of an electric current, and during such heating sucking nitrogenous gases through the charge contained in the furnace from a higher to a lower level, whereby the gases and other materials of the charge pass through the furnace in the same direction,

2. A process of producing nitrids and cyanids, which consists in charging the solid materials into an incompletely closed electric furnace provided with electrodes adaptlied to hang down in the charge Within the furnace, subjecting said charge to heat by an electric current carried by said electrodes, and during such heating operation sucking nitrogenous gases through the fur- 10 nace from a higher to a lower level, whereby the gases and the solid materials of the charge pass through the furnace in the same direction, the resulting gases being sucked out from a lower part of the furnace than that at which the charge andflthe nitrogenous gases are introduced into the furnace. -'i

In Witness whereof I have hereunto set my hand in presence of twowitnesses.

AXEL RUDOLF LINDBLAD.

Witnesses:

AUG. HAGELIN, ELSA JoHANsoN. 

